反应详情

To a solution of 22 (23.10 g, 91.56 mmol) in dry ethyl ether (150 mL) was added dropwise methyllithium (98.10 mL, 1.4 M in EtO2, 1.37.3 mmol) at 0° C. under nitrogen. The reaction mixture was stirred for 2 h allowing too reach room temperature. The reaction was slowly quenched with water, the phases were separated, and the aqueous phase was extracted with ethyl ether (3×150 mL). The combined organic solutions were dried over MgSO4 and concentrated over reduced pressure. Purification by flash column chromatography (silica gel, elution with hexanes/EtOAc: 80/20) provided the protected alcohol 20.62 g (76.77 mmol, 84%) as a pale yellow oil.

1. customallowing too reach room temperature
2. customThe reaction was slowly quenched with water
3. customthe phases were separated
4. extractionthe aqueous phase was extracted with ethyl ether (3×150 mL)
5. dry with materialThe combined organic solutions were dried over MgSO4
6. concentrationconcentrated over reduced pressure
7. customPurification
8. washby flash column chromatography (silica gel, elution with hexanes/EtOAc: 80/20)